https://weather.com/news/weather/video/fujiwhara-effect-watch-two-lows-do-a-dance-above-canada
Fujiwhara Effect: Watch Two Lows Do a "Dance" Above Canada
February 19, 2021
We sometimes talk about the fujiwhara effect during hurricane season, but hurricanes don't have to be involved to see the effect.
These two lows 'dancing' over northern Canada looks to me helped prolong the Record US southern Cold snap...
"Video Transcript
the darker gray squirrels that you see here are 2 low pressure systems over Canada and if you watch closely you'll see they do a little dance called the Fujiwara affect the food you wore a fact is named after meteorologist named Dr Fujiwara who figured out that sometimes 2 storms will move around a common pivot point and in this case there were 2 mid latitude cyclones less than 1200 miles away from each other captured by the goes east satellite in the days leading up to Valentine's day in the tropics it's uncommon for the 2 storms to merge and become a larger one just because 2 storms are in proximity and start to rotate many other outcomes are possible including the scenario where one system can ingest the other one and weakens it in this case we see a merge a split and then another merge sped up over the course of 5 days"
Tornadoes may be more common in early spring this year due to the ongoing La Niña.
On average, tornado potential moves northwestward from the winter months to the Plains states where the potential maximizes in May as the juxtaposition of heat, humidity and wind shear overlap in Tornado Alley.
But ingredients that are known to produce tornadoes come together in a distinctly more northern location in La Niña springs according to research published in the Journal of Applied Meteorology and Climatology in 2017.
La Niña is the periodic cooling of waters in the eastern equatorial Pacific that is known to change seasonal weather patterns throughout the world. El Niño is the warming of these same waters, which leads to different effects on weather patterns.
Several trends in severe weather ingredients were examined during both El Niño and La Niña seasons: jet stream level winds, low-level winds at around 5,000 feet, and instability.
Severe weather is possible when large storm systems have these ingredients, among others, available to them.
The first of these ingredients – wind shear – is most frequently available as we transition from winter to spring and the jet stream begins its typical retreat northward but remains strong. The stronger the winds at 30,000+ feet, often, the more wind shear there is.
According to the study, the jet stream is often farther north and more amplified in La Niña conditions. This northward alignment encourages the development of thunderstorms farther north and west, which creates the opportunity for more tornado outbreaks...
https://weather.com/storms/severe/news/2021-02-19-la-nina-severe-weather-season
Fujiwhara Effect: Watch Two Lows Do a "Dance" Above Canada
February 19, 2021
We sometimes talk about the fujiwhara effect during hurricane season, but hurricanes don't have to be involved to see the effect.
These two lows 'dancing' over northern Canada looks to me helped prolong the Record US southern Cold snap...
"Video Transcript
the darker gray squirrels that you see here are 2 low pressure systems over Canada and if you watch closely you'll see they do a little dance called the Fujiwara affect the food you wore a fact is named after meteorologist named Dr Fujiwara who figured out that sometimes 2 storms will move around a common pivot point and in this case there were 2 mid latitude cyclones less than 1200 miles away from each other captured by the goes east satellite in the days leading up to Valentine's day in the tropics it's uncommon for the 2 storms to merge and become a larger one just because 2 storms are in proximity and start to rotate many other outcomes are possible including the scenario where one system can ingest the other one and weakens it in this case we see a merge a split and then another merge sped up over the course of 5 days"
Tornadoes may be more common in early spring this year due to the ongoing La Niña.
On average, tornado potential moves northwestward from the winter months to the Plains states where the potential maximizes in May as the juxtaposition of heat, humidity and wind shear overlap in Tornado Alley.
But ingredients that are known to produce tornadoes come together in a distinctly more northern location in La Niña springs according to research published in the Journal of Applied Meteorology and Climatology in 2017.
La Niña is the periodic cooling of waters in the eastern equatorial Pacific that is known to change seasonal weather patterns throughout the world. El Niño is the warming of these same waters, which leads to different effects on weather patterns.
Several trends in severe weather ingredients were examined during both El Niño and La Niña seasons: jet stream level winds, low-level winds at around 5,000 feet, and instability.
Severe weather is possible when large storm systems have these ingredients, among others, available to them.
The first of these ingredients – wind shear – is most frequently available as we transition from winter to spring and the jet stream begins its typical retreat northward but remains strong. The stronger the winds at 30,000+ feet, often, the more wind shear there is.
According to the study, the jet stream is often farther north and more amplified in La Niña conditions. This northward alignment encourages the development of thunderstorms farther north and west, which creates the opportunity for more tornado outbreaks...
https://weather.com/storms/severe/news/2021-02-19-la-nina-severe-weather-season
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